This is the accompanying teacher's guide to the nervous system chapter "Thinking about the Nervous System." The chapter focuses on the brain's function in the nervous system, and how it relates to other parts of the nervous system.

This is the accompanying teacher's guide to the nervous system chapter "A Closer Look at the Brain." The chapter focuses on how neurologists study the brain, as well as the different functions each of the brain's parts performs.

This is the accompanying teacher's guide to the nervous system chapter "Reflexes: Neurons in Action." The chapter discusses how reflexes work and describes the reflex arc, the path of a reflex from sensing a stimulus to muscle action.